Net Loss per Share (Tables)

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Securities not included in the net loss per common share calculations

The following shares were not included in the computation of diluted net loss per share (in thousands):

	Three Months Ended March 31,
	2018	2017
Shares of common stock issuable pursuant to equity awards outstanding under the Equity Incentive Plan	7,530	7,661
Shares of common stock issuable upon exercise of outstanding warrants	—	73
Total shares excluded as anti-dilutive	7,530	7,734